I have a fistula and undergoing hd tor 2 yrs and i lift weights that's ok w/ my doc. is there a limit w/ the weights i carry and is my fistula safe?

Tricky: I cannot answer on your particular situation without a direct exam. Fistula's are sometimes partly artificial material like plastic. Fistula's sometimes when entirely natural (your own artery and vein) get abnormally shaped, scarred, fragile. In these cases, weight lifting might, possibly be a risk for some weight exercises.. Obviously, if you aren't putting any pressure on it, not much risk.